本题目来源于试卷: IB ESS Unit 1 Foundations of ESS，类别为 IB环境系统与社会
[单选题]
Identify which of the follt u:t s7q.)os guqb(l5 w.um:+b wq4jgowing is not considered a pollut yh:ra5 81whdsl) pu1nant.
A. Light
B. Natural gas
C. Invasive species
D. Sewage
参考答案: B
本题详细解析:
A pollutant is something humans add to the environment that hasd+-gh6n2yyw e+nymig a,39qe an impact on the organisms in the environment, and that cy +ngq+9 g-d62nm,a3h ywee yiannot be broken down faster than the rate at which it is being added.
Natural gas itself is not a pollutant unless it is combusted to form Carbon Dioxide. Option A is a pollutant in many circumstances, including in cities at night. Option C is considered a pollutant to ecosystems it is not native to. Option D is considered pollution in both soil and water.
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